[Standards] Bind2 question

Why are the inlined bind2 features inside <feature/> elements rather than using the exact same syntax as when announcing the same features in the stream features element (e.g. <csi xmlns='urn:xmpp:csi:0'/>) For reference: <bind xmlns='urn:xmpp:bind:0'> <inline> <feature var="urn:xmpp:carbons:2" /> <feature var="urn:xmpp:csi:0" /> <feature var="urn:xmpp:sm:3" /> </inline> </bind> -tmolitor